You take the total number of picture and multiply it by .12, which will get you the total number of black and white photos only.
600(.12)= 72
Answer:
25% increase
Step-by-step explanation:
Take the new number and subtract the original amount
90-72 = 18
Divide this amount by the original amount
18/72 = .25
Multiply by 100
25%
This is the percent increase
The first equation, 2x+y-8=0 :)
